短语词组短语Filth blockage [制冷]脏堵blockage signal 堵煤信号paraffin blockage 蜡堵blockage ratio 阻塞比active blockage [金融]主动禁止兑换Nitrogen blockage 氮塞Light Blockage 光阻法blockage calculation 堵塞计算 返回 blockage